Type-writer escapement.



No. 727,553. v PATENTED MAY 5, 1903 J. G. PETERSON.

TYPE WRITER ESGAPEMENT.

APPLIOATIONIILED mamas. 1902.

N0 MODEL.

il /#55555 liven/0F.

UNTTE STATES Patented May 5, 1903.

JOHN GODFREY PETERSON, OF NEW YORK, N. Y.

TYPE- WRITER ESCAPE M ENT.

SPECIFICATION forming part of Letters Patent No. 727,553, dated May 5, 1903. Application filed March 28, 1902. $erial1l0. 100,419. (No model.)

To aZZ whom it may concern.-

Be it known that 1, JOHN GODFREY PETER- SON, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvementsin Type-WVriter Escapements,of which the followingis a speci:

fication.

My invention relates to improvements in escapement-feed mechanism for'typawriters and analogous machines; and the'main objects of my improvement are simplicity and economy of construction and efficiency and convenience in use, especially with reference to spacing one tooth or more than one tooth of the feed member when desired.

In the accompanying drawings, Figure l is an elevation (which I may call a fronte1evation for convenience of description) of my escapement mechanism and so much of the feed member as is necessary to show its connection therewith,the taking-hold position of the front feed-pawl being indicated in broken lines. Fig. 2 is a like view of the same with both feed-pawls depressed for a return of the feed member. Fig. 3 is an enlarged plan view of the same with the two feed-pawls in their normal or taking-hold position, the feed member being indicated by broken lines. Fig. 4: is a vertical section on the line 00 x of Fig. 3. Fig. 5 is a side elevation of one of the pivotal screws, together with a vertical section of thesocketed member that is pivoted thereon. Fig. 6 is a detached view of the pawl-carrier, showing a modification in the stop for adjusting the pawls for dilferent feeds.

The feed member of many ordinary typewriters consists of a toothed wheel and in some a toothed bar or rack, the two being known equivalents. I have illustrated my improvement in connection with the bar or rack, as the feed member 7, and consider it unnecessary to illustrate the well-known feedwheel to which my escapement is also applicable. The rack 7 will be arranged in any ordinary or desired manner for operation in connection with the escapement mechanism hereinafter described.

My escapement is mounted in a bracket or frame 8, provided with ends, back, and two lugs 9, by means of which lugs the escapement may be attached to the machine by screws or rivets 10 passing through the said lugs. Pivoted to the frame 8 by means of pivot-screws 11 is a rocking frame 15, that rocks from front to rear, the extent of its rocking motion being adjustably limited by means of the stop-screws 12 and 13 in the back of'the frame 8, as will be readily understood upon a comparison of Figs. 3 and 4, the broken circle in Fig. 4 indicating the position of thepivot-screw. The said rocking frame is also provided with an operatingarm or extension 14:, by which to connect it to any suitable mechanism operated through the keys of the type-Writer, so as to pull the said extension downwardly for each rocking movement of the said frame 15. Pivoted or hinged to the back of this rocking frame is the vertically-swinging pawl-carrier 16, its pivot being formed by the screw 17. At one end of the pawl-carrier 16 there is an arm 18, that extends upwardly and rearwardly, and to the outer end of the said arm 18 a spring 19 is secured by one end, the other end of the said spring being secured to one of the lugs 9 or other fixed part of the main frame 8, whereby the said spring has a constant tendency to hold the pawl-carrier in its elevated position and also to hold the rocking frame 15 back against the stopscrew 12 to hold the extension or operating-arm 14c in its elevated position. The downward movement of the said arm and the rocking frameis limited by the stop-screw 13. The pawl-carrier 16 is stopped in its upward movement by the screw 20, the end of which screw strikes the upper edge of the rocking frame 15 at the base of the operating-arm 14:, as shown in Fig. 1. The pawl-carrier 15 is provided at its lower part with a projection 21, by means of which to connect the said pawl-carrier with any suitable lever or other mechanism for pulling the pawl-carrier downwardly on its pivot or hinge when desired.

Upon the pawl-carrier 16 I pivot two pawls 22 and 23 by means of the screw 24, the said pawls being so near the end of the rocking frame 15, on which the pawl-carrier is mounted, that the end of the said frame serves as a stop at times for limiting the movement of the said pawls in one direction. The pawl 22 is provided with a spring 25 for pulling the the said end of the said frame 15.

[0 pin 27 and sliding stop 28, mounted thereon,

the said stop being round and of two different diameters. When this stop is pulled out to its extreme limit on the post 27, as shown, the smaller diameter is the part against which the edge of the pawl engages when stopped thereby, so that the said pawl has a swinging movement equal to two feed-spaces or two teeth of the feed member or rack 7, as shown in Fig. 1. By pushing the stop inwardly to present its larger diameter to the edge of the pawl the movement of the said pawl is equal to only one feeding-space of the feed member instead of two. Of course if another stop or diameter were employed the pawl could be adjustcd for feedingthree teeth or spaces at one feed.

In Fig. 6 I have shown some of the same parts as in the other figures and have given them all the same reference numerals or characters except the stop 28, which is rotary instead of sliding and has three faces at different distances from its axis, so that the pawl may be set, as shown in Fig. 6, for feeding a space equal to only one tooth of the feed member or two or three teeth, according as the stop may be turned to present its different faces to the edge of the pawl. The lower end of the front pawl 23 is provided with a downwardly-extended finger 29, and

in the rocking frame there is a stop-screw 30,

set so low that the said finger will clear the stop-screw during the movement of the pawl when at its normal height. The said screw should also be so adjusted that when the pawl is in the position shown in Fig. 1 the vertical wall of the said finger 29 will be in about the same vertical plane as the end of the said stop-screw. This enables the pawlcarrier and pawls to be pulled downwardly out of engagement with the feed member for the return movement of the said feed memher, and when so pulled down, as shown in Fig. 2, the said stop-screw and finger prevent the pawl from moving under the influence of the spring 26 until after the pawl has been returned suificiently to engage'the rack again, so that there will be no feeding of the feed member upon the rengagement of the pawl. The said finger and screw also prevent the pawl-carrier and pawls from being pulled down to disengage the rack, excepting when the rack is at the end of its feeding stroke.

Instead of an ordinary comically-pointed pivot-screw I make the pivot end of the screws 11 substantially hemispherical and the socket intowhich they fit of a corresponding shape. This is believed to give them a very durable form and one that will give but a little friction.

When the feed member is at rest, the parts are in the position shown in Fig. 1. Upon depressing a key or spacing device the rocking frame is moved against the power of its spring 19 to pull the front pawl 23 out of engagement with the rack '7 and the rear pawl 22 into engagement therewith and in the same notch. As soon as the pawl 23 is out of engagement with the rack its spring moves it one, two, or three spaces, according to how the stop is set. The said pawl is shown by broken lines in .Fig. 1 as having moved a distance for feeding two spaces. As soon as the rocking frame is released by letting up the depressed key or spacer the spring 19 pulls the pawl 22 out of engagement with the rack and the pawl 23 into engagement therewith. The ordinary carriage-feed acts to move the rack along in the direction indicated by the dart in Fig. l, carrying the pawl 23 with it until the movement of the said pawl is stopped by the end of the rocking'frame 15, as shown in Fig. l, and thereby stops the feed member, ready for a repetition of the operation described.

While I have described the rear pawl as pivoted to the pawl-carrier and provided with a spring to hold it in position, the operation would be substantially the same if it were rigidly connected to the said carrier, excepting that the pivot enables the said pawl to move downwardly in substantially a vertical direction instead of swinging on the arc of a circle when the said carrier swings on the pivot 17.

I have herein used the words front and rear only with reference to the position of the parts as shown in the drawings and do not wish thereby to be understood as referring to any position that they may have with reference to the front and rear of a type-writer.

It is apparent that some changes from the specific construction herein disclosed may be made, and therefore I do not wish to be understood as limiting myself to the precise form of construction shown and described, but desire the liberty to make such changes in working my invention as may fairly come within the spirit and scope of the same.

I claim as my invention 1. In a machine of the class described, the combination of a toothed feed member with a rocking frame, a vertically-swinging pawlcarrier mounted on the said rocking frame, two pawls mounted side by side on the said carrier one of the said pawls being pivoted thereon, a stop on the said swinging frame for limiting the movement of the said pivoted pawl in one direction, a spring for pulling the said pawl out of engagement with the said stop, and an adjustable stop 30 arranged relatively to the said pivoted pawl for holding the said pawl against the action of the said spring when the pawl-carrier and pawls are disengaged from the toothed feed member, the said adjustable stop being out of action on the said pawl and spring when the said pawl-carrier and pawls are in position for operating in conjunction with the said toothed feed member, substantially as described.

In a machine of the class described, the combination of a toothed feed member, with the main frame, the pivotal screws 11 mounted on the said frame and having substantially semicircular pivotal ends, the rocking frame having sockets fitted to the pivotal ends of the said screws,a vertically-swinging pawl-carrier mounted on the said rocking frame, two pawls mounted side by side on the said pawl-carrier for moving into and out of the plane of the said feed member, one of the said pawls being pivoted on the said carrier, and a spring acting upon the said pivoted pawl to move it in the opposite direction from that of the forward movement of the said feed member, substantially as described.

3. In a machine of the class described, the combination of a toothed feed member with a rocking frame, a pawl carrier pivotally mounted on the said rocking frame for swinging transversely to the rocking movement of the said frame, two pawls pivotally mounted on the said pawl-carrier, a stop on the said frame for limiting the movement of the said two pawls in one direction, a spring for forcing one of the said pawls against the said stop, a spring for forcing the other one of the said pawls away from the said stop and an adj ustable stop for holding the latter pawl against the force of its spring when the said pawl-carrier is depressed by swinging on the pivot by which it is mounted on the rocking frame, substantially as described.

4. In a machine of the class described, the combination of a toothed feed member with a rocking frame having a vertically-arranged pawl-stop thereon, a pawl-carrier mounted on the said rocking frame for moving transversely to the rocking movement of the said frame, two pawls mounted on the said pawlcarrier, one of the said pawls being pivoted thereon in position for having its back engage the vertical stop on the said rocking frame when the said pawl is moved by the said feed member, a spring for holding the said pawlcarrier in its normal position, and a spring acting on the said pivoted pawl to pull it away from the said stop on the said rocking frame, substantially as described.

J. GODFREY PETERSON.

Witnesses:

WALTER W. SOHUTZ, EDWARD C. LANGDON. 

